Welcome to the cage of inquiring minds. Please leave your ego at the door when you click this thread in the future. There may be dogfights here, but think hard about lifting your leg to whiz on another poster here. You will just show everyone else how small you are. A previous attempt at open education on this forum was frequently criticized for length. Do you know that if you would want to learn about aeration on this forum today, and do a search, you have to wade through over 750 threads? What's the sense in even starting? But if you do, you'd quickly stumble on the <a href="http://www.lawnsite.com/showthread.php?s=&threadid=28321&highlight=aeration">"Out the window......." thread</a>, and maybe find a few things to tickle your mind. If your object in the green industry is to maximize your efficiency and increase your revenues in cutting grass, or to tell everyone else here how great you are, please stop here, and don't waste your time coming back in the future. There are plenty of other threads to keep you busy. If you want to expand your mind, or help others to expand theirs, hang on and let's explore. If anyone has a question, don't be concerned about asking it. Even if we have some here who can't understand the 2nd paragraph above, don't let small ones worry you. The only stupid question is the one that is not asked.